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[update-checkout] lower the default number of parallel processes #84081

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[update-checkout] lower the default number of parallel processes #84081

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8 changes: 5 additions & 3 deletions utils/update_checkout/update_checkout/parallel_runner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,11 +46,13 @@ def __init__(
pool_args: List[Union[RunnerArguments, AdditionalSwiftSourcesArguments]],
n_processes: int = 0,
):
self._monitor_polling_period = 0.1
if n_processes == 0:
n_processes = cpu_count() * 2
self._terminal_width = shutil.get_terminal_size().columns
# Limit the number of processes as the performance regresses after
# if the number is too high.
n_processes = min(cpu_count() * 2, 16)
self._n_processes = n_processes
self._monitor_polling_period = 0.1
self._terminal_width = shutil.get_terminal_size().columns
self._pool_args = pool_args
self._fn = fn
self._pool = Pool(processes=self._n_processes)
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